A hot air balloon rises due to hot air.

The hot air inside the balloon is less dense than the cooler air outside, causing the balloon to float upwards. As the air inside the balloon is heated, it expands and becomes lighter, creating lift. The pilot can control the altitude of the balloon by adjusting the temperature of the air inside the balloon using a burner. By adding more heat, the balloon will rise, and by letting the air cool, the balloon will descend. This principle of buoyancy allows hot air balloons to soar through the sky.

A hot air balloon rises due to the principle of buoyancy. The air inside the balloon is heated, which makes it less dense than the cooler air outside. As a result, the balloon experiences an upward force that causes it to rise.